Kongsberg MRU 5+ Motion Reference Unit

The MRU 5+ product is upgraded with the best MEMS based gyro

technology available. With exceptional low angle noise and bias

stability, the product is ideal for integrated INS/GNSS systems and

demanding survey applications.

Precision and Reliability

The MRU 5+ provides documented roll and pitch accuracy of 0.008°

and angle noise less than 0.002°. Every unit is delivered with an

individual calibration certificate documenting this accuracy. This is

made possible by use of accurate inertial sensors including three

rate gyros and linear accelerometers of excellent tactical navigation

grade performance. Very high reliability is achieved by using solid-state

sensors with no moving parts and the proven MRU electrical and

mechanical construction.

Advanced Motion Sensing Technology

The PFreeHeave algorithm uses past measurements to output a correct

and phase-free heave from MRU 5+. It has an advantage in long swell

conditions and for applications that can utilize a heave signal that is

delayed some minutes, typical for seabed mapping applications.

Additionally, a new MEMS based gyro is developed by Kongsberg Seatex

AS called MRG5 (Mru Rate Gyro) model 5. The MRG5 is optimized for use

in high-end applications. The MRU rate gyro combines very low noise,

excellent bias stability and outstanding gain accuracy and is the best

MEMS rate gyro available for maritime applications.

Ease of Integration and Application Flexibility

Interfacing the MRU 5+ to various sonar systems is made easy by including

data protocols for the most commonly used multibeam echo sounder systems

in the software. Using the configuration cable and the Windows version of the

configuration software, MRC+, a series of simple menu prompts allow the user

to choose the optimum configuration for his application. The MRU 5+ and the

MRC+ software are flexible and can accommodate a wide variety of application

types.

Key features

• 0.008° roll and pitch accuracy

• Exceptional low angle noise and bias stability

• High output data rate (200 Hz)

• Outputs on RS-232. RS-422 and Ethernet

• Precise heave at long wave periods by use of PFreeHeave algorithm

• Each MRU delivered with Calibration Certificate

• No limitation in mounting orientation

• Lever arm compensation to two individually configurable monitoring points

• Meets IHO special order requirements

• Small size, light weight, low power consumption

• 2-year warranty